There are a few types of companies that are essentially "immune" from worry for me. Larger, dominating grocers are one of them - hence why I own a significant amount in them across virtually all invested geographies. Utilities that are well-managed and well-capitalized are another.
A third is Norwegian, state-owned companies - or in part state-owned corporations. Most of my larger Norwegian investments fall into this category, as the Norwegian state is a very active shareholder in most of the significant corporations in our neighboring country.
Norsk Hydro (NHYDY) is one. Usually, owning